有没有人实施RadioButtonListFor＆LT; T＆GT; ASP.NET MVC的？ [英] Has anyone implement RadioButtonListFor<T> for ASP.NET MVC?

问题描述

有在ASP.NET MVC期货的 Html.RadioButtonList 扩展方法。有没有人发现了一个code的强类型版本 RadioButtonListFor＆LT; T＆GT; 。它看起来像这样一个观点：

 ＆LT;％= Html.RadioButtonListFor（型号=＆GT; model.Item，Model.ItemList）％GT;
 

解决方案

下面是aspx页面使用

 ＆LT;％= Html.RadioButtonListFor（M = GT; m.GenderRadioButtonList）％GT;
 

下面是视图模型

 公共类HomePageViewModel
{
    公共枚举GenderType
    {
        男，
        女
    }
    公共RadioButtonListViewModel＆LT; GenderType＆GT; GenderRadioButtonList {搞定;组; }    公共HomePageViewModel（）
    {
        GenderRadioButtonList =新RadioButtonListViewModel＆LT; GenderType＆GT;
        {
            ID =性别，
            的SelectedValue = GenderType.Male，
            ListItems的=新名单＆LT; RadioButtonListItem＆LT; GenderType＆GT;＆GT;
            {
                新RadioButtonListItem＆LT; GenderType＆GT;的{text =男，值= GenderType.Male}，
                新RadioButtonListItem＆LT; GenderType＆GT;的{text =女，值= GenderType.Female}
            }
        };
    }
}
 

下面是用于单选按钮列表视图模型

 公共类RadioButtonListViewModel＆LT; T＆GT;
{
    公共字符串ID {搞定;组; }
    私人ŧ了selectedValue;
    公共ŧ的SelectedValue
    {
        {返回了selectedValue; }
        组
        {
            了selectedValue =价值;
            UpdatedSelectedItems（）;
        }
    }    私人无效UpdatedSelectedItems（）
    {
        如果（ListItems的== NULL）
            返回;        ListItems.ForEach（李= GT; li.Selected =等于（li.Value，的SelectedValue））;
    }    私人列表＆LT; RadioButtonListItem＆LT; T＆GT;＆GT; listItems中;
    公开名单＆LT; RadioButtonListItem＆LT; T＆GT;＆GT; ListItems的
    {
        {返回时listItems; }
        组
        {
            时listItems =价值;
            UpdatedSelectedItems（）;
        }
    }
}公共类RadioButtonListItem＆LT; T＆GT;
{
    公共BOOL选择{搞定;组; }    公共字符串文本{搞定;组; }    公众的T值{搞定;组; }    公共重写字符串的ToString（）
    {
        返回Value.ToString（）;
    }
}
 

下面是RadioButtonListFor扩展方法

 公共静态类HtmlHelperExtensions
{
    公共静态字符串RadioButtonListFor＆LT;的TModel，TRadioButtonListValue＆GT;（此的HtmlHelper＆LT;的TModel＆GT;的HtmlHelper，防爆pression＆LT; Func键＆LT;的TModel，RadioButtonListViewModel＆LT; TRadioButtonListValue＆GT;＆GT;＆GT;前pression）其中的TModel：类
    {
        返回htmlHelper.RadioButtonListFor（如pression，NULL）;
    }    公共静态字符串RadioButtonListFor＆LT;的TModel，TRadioButtonListValue＆GT;（此的HtmlHelper＆LT;的TModel＆GT;的HtmlHelper，防爆pression＆LT; Func键＆LT;的TModel，RadioButtonListViewModel＆LT; TRadioButtonListValue＆GT;＆GT;＆GT;前pression，对象htmlAttributes）其中的TModel：类
    {
        返回htmlHelper.RadioButtonListFor（如pression，新RouteValueDictionary（htmlAttributes））;
    }    公共静态字符串RadioButtonListFor＆LT;的TModel，TRadioButtonListValue＆GT;（此的HtmlHelper＆LT;的TModel＆GT;的HtmlHelper，防爆pression＆LT; Func键＆LT;的TModel，RadioButtonListViewModel＆LT; TRadioButtonListValue＆GT;＆GT;＆GT;前pression，IDictionary的＆LT;字符串对象＆gt; htmlAttributes），其中的TModel：类
    {
        VAR inputName = GetInputName（如pression）;        RadioButtonListViewModel＆LT; TRadioButtonListValue＆GT;单选按钮列表=的GetValue（的HtmlHelper，前pression）;        如果（单选按钮列表== NULL）
            返回的String.Empty;        如果（radioButtonList.ListItems == NULL）
            返回的String.Empty;        VAR divTag =新TagBuilder（分区）;
        divTag.MergeAttribute（ID，inputName）;
        divTag.MergeAttribute（类，无线）;
        的foreach（在radioButtonList.ListItems VAR项）
        {
            VAR radioButtonTag =单选按钮（的HtmlHelper，inputName，新SelectListItem的{text = item.Text，选择= item.Selected，值= item.Value.ToString（）}，htmlAttributes）;            divTag.InnerHtml + = radioButtonTag;
        }        返回divTag + htmlHelper.ValidationMessage（inputName，*）;
    }    公共静态字符串GetInputName＆LT;的TModel，TProperty＆GT;（防爆pression＆LT;＆Func键LT;的TModel，TProperty＆GT;＆GT;前pression）
    {
        如果（如pression.Body.NodeType ==前pressionType.Call）
        {
            VAR methodCallEx pression =（MethodCallEx pression）前pression.Body;
            字符串名称= GetInputName（methodCallEx pression）;
            返回name.Substring（例如pression.Parameters [0] .Name.Length + 1）;        }
        返回前pression.Body.ToString（）子串（如pression.Parameters [0] .Name.Length + 1）。
    }    私人静态字符串GetInputName（MethodCallEx pression前pression）
    {
        // P =＆GT; 。p.Foo.Bar（）Baz.ToString（）=＆GT; p.Foo或抛出...        VAR methodCallEx pression =前pression.Object作为MethodCallEx pression;
        如果（methodCallEx pression！= NULL）
        {
            返回GetInputName（methodCallEx pression）;
        }
        返回前pression.Object.ToString（）;
    }    公共静态字符串单选按钮（这的HtmlHelper的HtmlHelper，字符串名称，SelectListItem的listItem，
                         IDictionary的＆LT;字符串对象＆gt; htmlAttributes）
    {
        VAR inputIdSb =新的StringBuilder（）;
        inputIdSb.Append（名）
            。附加（_）
            .Append（listItem.Value）;        VAR SB =新的StringBuilder（）;        VAR建设者=新TagBuilder（输入）;
        如果（listItem.Selected）builder.MergeAttribute（选中，检查）;
        builder.MergeAttribute（类型，无线电）;
        builder.MergeAttribute（价值，listItem.Value）;
        builder.MergeAttribute（ID，inputIdSb.ToString（））;
        builder.MergeAttribute（名，名称+.SelectedValue）;
        builder.MergeAttributes（htmlAttributes）;
        sb.Append（builder.ToString（TagRenderMode.SelfClosing））;
        sb.Append（RadioButtonLabel（inputIdSb.ToString（），listItem.Text，htmlAttributes））;
        sb.Append（＆LT; BR＆gt;中）;        返回sb.ToString（）;
    }    公共静态字符串RadioButtonLabel（字符串inputId，串displayText，
                                 IDictionary的＆LT;字符串对象＆gt; htmlAttributes）
    {
        VAR labelBuilder =新TagBuilder（标签）;
        labelBuilder.MergeAttribute（代表，inputId）;
        labelBuilder.MergeAttributes（htmlAttributes）;
        labelBuilder.InnerHtml = displayText;        返回labelBuilder.ToString（TagRenderMode.Normal）;
    }
    公共静态TProperty的GetValue＆LT;的TModel，TProperty＆GT;（的HtmlHelper＆LT;的TModel＆GT;的HtmlHelper，防爆pression＆LT; Func键＆LT;的TModel，TProperty＆GT;＆GT;前pression）其中的TModel：类
    {
        的TModel模型= htmlHelper.ViewData.Model;
        如果（型号== NULL）
        {
            返回默认值（TProperty）;
        }
        FUNC＆LT;的TModel，TProperty＆GT; FUNC =前pression.Compile（）;
        返回FUNC（模型）;
    }
}
 

There was an Html.RadioButtonList extension method in ASP.NET MVC Futures. Has anyone found a code for a strongly typed version RadioButtonListFor<T>. It would look like this in a view:

<%= Html.RadioButtonListFor(model=>model.Item,Model.ItemList) %>

解决方案

Here is the usage in the aspx page

    <%= Html.RadioButtonListFor(m => m.GenderRadioButtonList)%>

Here is the view model

public class HomePageViewModel
{
    public enum GenderType
    {
        Male,
        Female
    }
    public RadioButtonListViewModel<GenderType> GenderRadioButtonList { get; set; }

    public HomePageViewModel()
    {
        GenderRadioButtonList = new RadioButtonListViewModel<GenderType>
        {
            Id = "Gender",
            SelectedValue = GenderType.Male,
            ListItems = new List<RadioButtonListItem<GenderType>>
            {
                new RadioButtonListItem<GenderType>{Text = "Male", Value = GenderType.Male},
                new RadioButtonListItem<GenderType>{Text = "Female", Value = GenderType.Female}
            }
        };
    }
}

Here's the view model used for radio button lists

public class RadioButtonListViewModel<T>
{
    public string Id { get; set; }
    private T selectedValue;
    public T SelectedValue
    {
        get { return selectedValue; }
        set
        {
            selectedValue = value;
            UpdatedSelectedItems();
        }
    }

    private void UpdatedSelectedItems()
    {
        if (ListItems == null)
            return;

        ListItems.ForEach(li => li.Selected = Equals(li.Value, SelectedValue));
    }

    private List<RadioButtonListItem<T>> listItems;
    public List<RadioButtonListItem<T>> ListItems
    {
        get { return listItems; }
        set
        {
            listItems = value;
            UpdatedSelectedItems();
        }
    }
}

public class RadioButtonListItem<T>
{
    public bool Selected { get; set; }

    public string Text { get; set; }

    public T Value { get; set; }

    public override string ToString()
    {
        return Value.ToString();
    }
}

Here's the extension methods for RadioButtonListFor

public static class HtmlHelperExtensions
{
    public static string RadioButtonListFor<TModel, TRadioButtonListValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, RadioButtonListViewModel<TRadioButtonListValue>>> expression) where TModel : class
    {
        return htmlHelper.RadioButtonListFor(expression, null);
    }

    public static string RadioButtonListFor<TModel, TRadioButtonListValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, RadioButtonListViewModel<TRadioButtonListValue>>> expression, object htmlAttributes) where TModel : class
    {
        return htmlHelper.RadioButtonListFor(expression, new RouteValueDictionary(htmlAttributes));
    }

    public static string RadioButtonListFor<TModel, TRadioButtonListValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, RadioButtonListViewModel<TRadioButtonListValue>>> expression, IDictionary<string, object> htmlAttributes) where TModel : class
    {
        var inputName = GetInputName(expression);

        RadioButtonListViewModel<TRadioButtonListValue> radioButtonList = GetValue(htmlHelper, expression);

        if (radioButtonList == null)
            return String.Empty;

        if (radioButtonList.ListItems == null)
            return String.Empty;

        var divTag = new TagBuilder("div");
        divTag.MergeAttribute("id", inputName);
        divTag.MergeAttribute("class", "radio");
        foreach (var item in radioButtonList.ListItems)
        {
            var radioButtonTag = RadioButton(htmlHelper, inputName, new SelectListItem{Text=item.Text, Selected = item.Selected, Value = item.Value.ToString()}, htmlAttributes);

            divTag.InnerHtml += radioButtonTag;
        }

        return divTag + htmlHelper.ValidationMessage(inputName, "*");
    }

    public static string GetInputName<TModel, TProperty>(Expression<Func<TModel, TProperty>> expression)
    {
        if (expression.Body.NodeType == ExpressionType.Call)
        {
            var methodCallExpression = (MethodCallExpression)expression.Body;
            string name = GetInputName(methodCallExpression);
            return name.Substring(expression.Parameters[0].Name.Length + 1);

        }
        return expression.Body.ToString().Substring(expression.Parameters[0].Name.Length + 1);
    }

    private static string GetInputName(MethodCallExpression expression)
    {
        // p => p.Foo.Bar().Baz.ToString() => p.Foo OR throw...

        var methodCallExpression = expression.Object as MethodCallExpression;
        if (methodCallExpression != null)
        {
            return GetInputName(methodCallExpression);
        }
        return expression.Object.ToString();
    }

    public static string RadioButton(this HtmlHelper htmlHelper, string name, SelectListItem listItem,
                         IDictionary<string, object> htmlAttributes)
    {
        var inputIdSb = new StringBuilder();
        inputIdSb.Append(name)
            .Append("_")
            .Append(listItem.Value);

        var sb = new StringBuilder();

        var builder = new TagBuilder("input");
        if (listItem.Selected) builder.MergeAttribute("checked", "checked");
        builder.MergeAttribute("type", "radio");
        builder.MergeAttribute("value", listItem.Value);
        builder.MergeAttribute("id", inputIdSb.ToString());
        builder.MergeAttribute("name", name + ".SelectedValue");
        builder.MergeAttributes(htmlAttributes);
        sb.Append(builder.ToString(TagRenderMode.SelfClosing));
        sb.Append(RadioButtonLabel(inputIdSb.ToString(), listItem.Text, htmlAttributes));
        sb.Append("<br>");

        return sb.ToString();
    }

    public static string RadioButtonLabel(string inputId, string displayText,
                                 IDictionary<string, object> htmlAttributes)
    {
        var labelBuilder = new TagBuilder("label");
        labelBuilder.MergeAttribute("for", inputId);
        labelBuilder.MergeAttributes(htmlAttributes);
        labelBuilder.InnerHtml = displayText;

        return labelBuilder.ToString(TagRenderMode.Normal);
    }


    public static TProperty GetValue<TModel, TProperty>(HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression) where TModel : class
    {
        TModel model = htmlHelper.ViewData.Model;
        if (model == null)
        {
            return default(TProperty);
        }
        Func<TModel, TProperty> func = expression.Compile();
        return func(model);
    }
}

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